Power operated typewriter



May 12%, 31953 F. Wm SQK-iREMP 2,638,199

POWERWOPERATED TYPEWRITER Filed June 25, 1949 6 Sheets-Sheet l ATTORNEYF'. W. SC H RE M P POWER" OPERATED TYPEWRITER May 12, 1953 6Sheets-Sheet 2 Filed June 25, 1949 F. W. SCH REMP POWER'OPERATEDTYPEWRITER '6 Sheets-Sheet 3 Filed June 25, 1949 fiederz'cii llfchremp 4ENT - ATTORNEY May 1?, @953 F. w. SCHREMP POWER-OPERATED TYPEWRITER 6SheecsSheet 4 Filed June 25, 1949 fiedericfi/Kficiz rem 19 INVE NTOATTORN EY May 12, 1953 F. w. SCHREMP 2,

.POWER*OPERATED TYFEWRITER Filed June 25, 1949 6 Sheets-Sheet 5 POSITIONN0. 2

POSITION N04 INVENTOR Y 1953 F. w. SCHREMP 2,638,199

POWER'OPERATED TYPEWRITER Filed June 25, 1949 6 Sheets-Sheet 6 PatentedMay 12, 1953 POWER OPERATED TYPEWRITER Frederick W. Schremp, Elmira, N.Y., assignor to Remington Rand Inc.,-New York, N. Y., a. corporation ofDelaware Application June 25, 1949, Serial No. 101,450

This invention relates to power operated typewriters and particularly toa typewriter having the type actions actuated by a continuously drivenpower roll operated by an electric motor.

The typing and other parts of a typewriter usually operated by manualactuation of the key levers are power actuated according to the presentinvention from the continuously rotating power driven roll by selectivekey lever operation of the power operating mechanism.

The power operating mechanism of the present invention has a pluralityof spaced parallel power arms with eccentrics rotatably mounted thereonfor peripheral engagement with the power driven roll for moving thepower arms so that one end of an operated power arm will engage a typingor other device produce a complete operation thereof for each revolutionof the eccentric. The operation of the power arm and eccentric by thepower driven roll is controlled by manual operation of the lrey loversto selectively operate the desired typing and other device in the usualmanner from the typewriter keyboard. The key levers control theoperation of a trigger for each power arm. Each trigger is formed toengage and operate a trip member controlling the rotation of theeccentric. When a key lever is manually operated according to thepresent invention, it will the trigger with the trip member for thecorresponding power arm and disengage the trip a member from theeccentric so that it may have limited movement immediately upon releaseof the trip member to enga e the continuously rotating power drivenroll. As soon as the periphoi the eccentric engages the continuouslyrototing power roll it will rotate with the power roll and by reason ofits eccentric mounting on the power arm will cause power arm mounted 18Claims. (CL 197--17-) on pivot at one end, to rotate on this pivot sothat the opposite end will move back and forth according to theeccentricity of the eccentric. trigger and trip member cooperate tocontrol the rotation of the ecce. so that for each oporation of a keylever, the eccentric is released for. operation by the power driven rollthrough one revolution only. The eccentric is positioned so that theportion of the periphery having the shortest radius from the axis ofrotation is dire. ed toward the power driven roller in the position ofrest or inoperative position of the power arm when the trip member isengaged with the eccentric to i'iornially holclit against'rotation.

The eccentric and operation of the power arm is controlled by the tripmember and trigger through key lever operation 50 that the eccentric orpower arm will be moved slightly to engage the periphery of theeccentric with the power roller as soon as a Key lever is manuallydepressed. The power roller will then rapidly rotate the eccentric andmove the power arm on its pivot so that the free end will be moved toengage and operate a typing or other device through approximately onehalf of the rotation of the eccentric by the power driven roll from thepoint of shortest radius of the eccentric from its center to the pointof longest radius. produces movement of the power arm in one directionto secure the power operation of the typing or other device after whichthe power arm returns to its starting position when the trip member willengage and latch the eccentric in a position where it. becomesdisengaged from the power roll in a position ready to start a subsequentoperation of the power arm for a repeated operation of the typing orother device.

Means are provided by the invention through the cooperation of thetrigger and trip 1nechanism with the eccentric and power arm to preventmore than one operation of the typing or other device by a power arm foreach depression operation of typing or other devices. By varying thepower applied to the typing or other devices, particularly the typebars, the force of impact of the type with the platen may be variedwithin a desiresL range. This is principally useful in producingmultiple copies of typewritten matter.

The end portion of each power arm positioned to engage a typing or otherdevice is adjustable relative to the eccentric and pivot for the powerarms. ihis construction provides for adjustment of each power armrelative to the others for obtaining a uniform impact or variation inthe force of impact of each type bar with the platen. It also providesfor the desired movement of the power arm in operatingthe other devicessuch the carriage return, case shift, ribbon feed, etc.

Elie operation of the power arm by the eccentric as provided by thepresent invention secures an improved operation in which the power rollis subjected to a minimum amount of wear due to the eccentrics beingfreely rotatable on the power arms for free rotation during contact withthe power driven roll. The invention also provides This.

for the construction of a power arm, eccentric and trip mechanism as aunit so that a plurality of either of these units may be readilyinstalled and adjusted to secure the desired operation of the typeactions and other key lever actuated devices of the typewriter.

In the drawings:

Fig. 1 shows portions of a typewriter in perspective to illustrate atype action, power driven roll, the power operating assembly for twotype actions and the controls operated by the key levers, portions beingbroken away and shown in cross-section for convenience in illustratingthe invention.

Fig. 2 is an enlarged vertical cross-section through a typewriter withportions omitted and other portions shown in cross-section and brokenaway illustrating a type action and the key lever actuated trigger andtrip mechanism on one power arm in side elevation in the position ofrest with the mechanism used for operating the ribbon vibrator.

Fig. 3 is a fragmentary vertical cross-section similar to Fig. 2 showingonly the power operating mechanism and the adjusting means for varyingthe position thereof with the parts shown at the opposite limit ofadjustment from that shown in Fig. 2, the power arm having the end forengaging the type bar bell crank arranged at the greatest distance awayfrom the bell crank so that the period during which the power arm isengaged with the bell crank is less than with the parts adjusted in theposition shown in Fig. 2.

Fig. 4 is a fragmentary front elevation of a portion of the typewritershowing the lever for adjusting the power arm assembly to change theimpact pressure of the type bars on the platen.

Fig. 5 shows an enlarged diagrammatic illustration of the power drivenroll and power arm assembly illustrating in full lines the position ofrest or starting position, designated No. 1, of a power arm, tripmechanism, trigger assembly and type bar, while the dot and dash lineposition shown illustrates a second or No. 2 position of the power armassembly resulting from depressing the type bar to operate the triggerand trip mechanism for releasing the eccentric to cause the peripherythereof to engage the power driven roll with a slight downward movementof the power arm for starting the movement of the power arm by the powerdriven roll to secure the operation of a type action or similar device.

Fig. 6 is a view similar to Fig. 5 illustrating in dot and dash linesanother position in the cycle of operation of the power arm andeccentric designated No. 3, showing the position at which the trip leveris about to disengage the trigger with the trigger shown in the positionin which it is held during manual depression of a key lever, the powerarm having begun its operating stroke through the operation of theeccentric by the power driven roll. The full line position in Fig. 6shows the power arm. and trip mechanism in the No. 4 position in whichthe eccentric has moved 180 degrees from the No. 1 position shown inFig. 5, so that the portion of greatest radius has moved around until itis in engagement with the power driven roll and has moved the power armupwardly to the limit of its upward pivotal movement from the No. 1 and2 positions shown in Fig. 5 to secure a complete operation of a typeaction or other actuated part of a typewriter.

Fig. '7 shows a modified form of power arm eccentric, trip member andtrigger construction from that shown in the preceding figures invertical transverse cross-section with the power arm, eccentric andtrigger mechanism shown in elevation diagrammatically with the parts inthe position of rest or starting position herein described as No. 1position, as indicated in connection with the showing in Fig. 5.

Fig. 8 is a diagrammatic view of the power operating mechanism, as shownin Fig. 7, with the parts shown in the No. 2 position, which is theposition showing depression of a key lever to operate the trip mechanismand release the eccentric for engaging the power driven roll.

Fig. 9 shows the No. 4 position of the modified form of Fig. 7, with theeccentric having its longest radius extending downwardly from its axisand engaging the periphery of the power driven roll.

Fig. 10 is a view of the structure shown in Figs. 7 to 9 showing theeccentric at a point where it has nearly completed one revolution ofoperation by the power roll from the position shown in Fig. 7 aftermanual operation of a type bar, in which the typ bar and triggermechanism is shown in the depressed position for illustrating how thetrip and trigger mechanism cooperate to prevent a repeat operation ofthe type bar during one depression of a key lever.

Fig. 11 is a perspective showing a power arm, eccentric and trip levermechanism constructed as shown in Fig. '7, in disassembled separatedrelation to illustrate details of construction and assembly of theeccentric on the power arm.

Fig. 12 is a view similar to Fig. '7 illustrating another modified formof power arm and trip lever mechanism showing the parts in the positionof rest or No. 1 position.

Fig. 13 is a view similar to Fig. '7 illustrating another modified formof power arm, eccentric and trip lever construction in the position ofrest or starting position referred to herein as the No. 1 position.

Fig. 14 is a view looking at the opposite side of the power arm fromthat shown in Fig. 13.

Fig. 15 shows a modified form of trigger in side elevation.

The invention is described and shown in the drawings as applied to aRemington typewriter, more specifically known as a Model 17 or RemingtonKM The typewriter mechanism with the exception of those partsillustrated in this application is substantially similar to thestructure shown in Patents Nos. 2,289,531, July 14, 1942; 2,304,216,December 8, 1942; 2,326,312, August 10, 1943; and U. S. application,Serial No. 66,672, filed December 22, 1948, now U. S. Patent No.2,579,763, in view of which only those portions of a typewriter areillustrated as are necessary to show the invention in association withrelated typewriter parts.

Portions of a conventional Remington typewriter, such as shown in theaforementioned patents and application, are illustrated in the drawingsand include spaced parallel side frames 1 which are connected at desiredpoints by transversely extending bars, some of which are shown and willbe hereinafter described. These side frames support the principaloperating mechanism of the typewriter including the type action and keylevers and according to the present invention also support the powerdriven roll. The conventional type guide 2 is mounted on type segment 3.Type segment 3 is mounted on transversely extending shift bar 4vertically movable in guides at opposite ends carried by side frames lto provide the conventional case shift for upper aossuoo and lower caselettersas shown Patent No. 2,289,531. A plurality of type :bars .5 arepivotally mounted 'in type segment 3. only a central and an end type bar5 being illustrated in Fig. l with the associated operating mechanismfor each of these type bars. The usual type lbar cushion .6 is suitablymounted on arms carried by type seg" ment 3 for supporting the type barsin the position of rest. A transversely extending shaft l is rotatablymounted in. side frames II and forms part of the segment shiftmechanism.

A power driven roll 3 is rotatably mount-ed in transversely extendingrelation between the lower edges of side frames l toward the frontportion thereof and is continuously rotated by suitable electric motordrive means which is not illustrated since this mechanism may The of anyconventional type. Roll 8 has shaft extension rotatably mounted inbearings 9 inside frames I, see Fig. 1. Roll 3 is formed of a tubularmetal sleeve provided with a covering of resilient rubher or othersuitable material to provide .a .cylindricai outer surface having goodfriction drive characteristics.

A fulcrum bar it) is mounted :front of roll & and has a pair ofsupporting arms H secured to opposite ends thereof and extending aroundthe front edges of side frames I and having the rear ends pivotallymounted on pivot screws 12 extend" ing through apertures in side framesl and threadedly mounted in pivoted supporting brackets it. Supportinghracltets I13 are pivoted on studs it mounted on side frames I. Studs Mproject inwardly from the front portions thereof and are located betweenpivot screws 1'2 and fulcrum bar it in a position closer to the 111-crum bar. Supporting brackets 13 have t5 projecting upwardly along theinner faces of side frames i with a set screw 1H5 at the upper of eacharm. Each screw l6 projects through enlarged apertures in one side offrame with the head engaged on the outer face of the side frame. One ofthesesupporting-brackets it is mounted on the inner face of each sideframe 2 to support arms H .on opposite ends of fulcrum liar I ll. Thismounting for the fulcrum bar with apertures inside frames lsubstantially larger than the shanks of screws '12 carried by bracketsl3, provide for adjustment of the pivotal mounting for arms '5 l andfulcrum bar l'il so that the position of the axis for the pivotalmounting of fulcrum bar it? may be changed with respect to the poweroperating mechanism of the typewriter for the purposes hereinafterdescribed.

Fulcrum bar iii is formed with a plurality of transverse spaced parallelslots in the upper edge for receiving and pivotally mounting a pluralityoi power arms 2 3 in spaced parallel relation on pivot rod 25 mounted onthe fulcrum bar. Power arms to extend in transverse relation to powerroll 8 rearwarolly over the power roll. Each power "arm to has a roller22 mounted on the tree rear end for engagement with cam projection it ontype bar bell crank 24. Each bell crank. Ed is pivotally mounted on rod25 at the lower end. Rod 25 is carried by bell crank supporting barextending transversely across the lower portion of the typewriter andsecured at opposite ends to side frames I.

An anchor plate 21 is mounted on the lower 7 edge of bell'cranksupport-ing bar 26 to provide an anchor along the frontcolgeforpower arm operating springs 28, one for each power arm 2o havingoneend anchored to platel 'i and the opposite end to the power'arm inthe rear-ofnpower driven roll 8 for normally moving powerarrns 2pdownwardly toward roll 8 about their pivots on 1106,21. The rear edge ofanchor plate 21 provides an anchor for one end of hell crank operatingsprings 29 having the opposite ends attached to rearwardly extendingarms 36 on bell cranks 2 5. Springs '23 normally operate bell cranks 24in a counter-clockwise direction, as shown in Fig. 2. A plurality oftype bar operating links 3! each have one end secured to the upper endof a bell crank 2.4 and the opposite end pivotally -secured to the lowerend of one-of a plurality of type bars E5. The type bars 5 are pivotallyse cured on type bar pivot rod 33 carried by type segment 3. Type bar-s5 are arranged in the usual manner on type segment 3 for pivotalmovement to have printing engagement with platen 34, Fig. 2, in thecenter position aligned with type guide 2 in a manner now well known inthe art.

An eccentric $5 for each power arm Ell is rotatably mounted. on stubshaft carried :by the lower central portion of each power arm 20. Stubshaft 36 arranged so that the smaller radius of the eccentric betweenthe axis and the periphery will project below the lower edge of powerarm :Zil in a position to engage the periphery of power driven roll ll.The axis of stub shaft 35 on each power arm till is further arranged inthe vertical plane through the axis of power driven roll t insubstantially parallel relation so that each eccentric 35 is directlyabove roll 13. The eccentrics 35, as shown in Figs. 1 and are ofcircular shape, but it will 'beunder stood that they may be of any otherdesired shape in outline. These eccentrics are in the form of discswhich may be made from metal, plastic or other desired material. Alength or" radii between the shortest and longest radii of eacheccentric 3%; is selected to secure the desired movement of each powerarm Pill on pivot rod 2! relative to power -.driven roll The eccentricsare mounted on all of the arms in the same position and are of the samedimension so as to obtain a construction where all of power arms areoperated on their pivots to produce the. same amount of arcuate movementin oscillation back and forth toward and from the power roll. Itconceivable that for power operation of some parts of the typewritermechanism, eccentrics of difierent shape andsiae from the others may beused.

The mounting for fulcrum bar lid on pivot screws 2 provides for themovement of fulcrum bar I t" for adjusting the position of theoscillating movement of power rms relative to power roll 3 and bellcranks 2 t. Pivot screws it are positioned on side frames l insubstantially coaxial relation with stub shafts .35 (in the position ofrest -for power arms 23 as shown in Figs. 1 and 2. Fulcrum bar i ll maybe moved up and down about the axis of stub shafts so and eccentrics 35,as shown in Figs. 1 and 2. This up and down movement of fulcrum bar illwill move rollers 22 on the free ends of power arms Ell away from camprojections 23 of bell cranks M as the fulcrum bar in is moved upwardlyand will be moved toward projection 23 when fulcrum bar it is moveddownwardly. This provides for an adjustment of power arms when they aremoved in an'upward direction by the operation of power roll 8 rotatingeccentrics to secure a greater or smaller amount of power operation ofeach bellcrank 2 5 according to the position in which fulcrum loar Hi isadjusted. This varies the pressure of the irnpact-of each typehar on theplaten in the printing operation so that either a greater or lighterpressure can be obtained by adjustment of fulcrum bar ID for producingdarker or lighter printing and also for producing a greater number ofcarbon copies as the impact pressure is increased.

The mechanism for securing this adjustment is shown in Figs. 1 to 4inclusive. A cam plate is mounted on transversely extending frame bar 4!secured at its ends to side frames i. Cam plate 40 is formed with a slot42 for receiving fulcrum bar adjusting cam 43 therein for free rotatingmovement. Cam 43 is rotatable on cam stud 44 threadedly mounted in thecentral por tion of fulcrum bar it]. Cam 43 has a fulcrum bar adjustinghandle 45 mounted on the rear side thereof in the rear of cam plate 46and in front of fulcrum bar l0, as shown in Figs. 2 and When handle 45is rotated in a clockwise direc tion, as shown in Figs. 1 and 4, fulcrumbar adjusting cam 43 operates in slot 42 to move fulcrum bar I!)upwardly to reduce the extent of the power operating stroke of the typebar bell cranks and adjust power arms 26 into the position shown in Fig.3. When handle 45 is moved from the full line position as shown in Figs.1 and 4, to the dotted line position as shown in Fig. 4, by movement ina counter-clockwise direction, fulcrum bar It is moved downwardly fromthe position shown in Fig. 3 to that shown in Fig. 2, so that therollers 22 are closer to cam projections 23 on the type bar bell cranksto secure the full power operation of bell cranks by power arms 26 forobtaining a maximum impact pressure of each type bar 5 against platent4. Handle 45 may obviously be adqjusted to any intermediate positionbetween the full and dot and dash positions shown in Fig. 4 to securevarying degrees of impact pressure of the type bars against the platen.

The operation of each power arm 26 is controlled by a trip mechanismforming part of each power arm assembly. Each trip mechanism con trolsthe power arm and eccentric in the starting position or position of restas shown, for example,

in Figs. 2 and 5 which is referred to in the description herein as theNo. 1 position. This trip mechanism is also controlled and operated by atrigger mechanism in turn controlled and operated by manual operation ofa key lever. A separate power arm, trip mechanism, trigger mechanism andkey lever is provided for each type action or other actuate-d devicewhich it is desired to control from the keyboard of the machine. Theconstruction and operation of one trip mechanism will serve to describeall of the trip mechanisms and the same applies to the description ofthe construction and operation of each type bar and trigger mechanism,all of which are made in the same manner for each power arm 29.

The trip mechanism, as shown in Figs. 1 to 6 inclusive, has a trip lever46 pivoted at one end on stud 41 carried by depending arm 48 formingpart of power arm 20. The opposite end of trip lever 46 is formed toprovide a hook-shaped retaining finger 49 positioned to engage alaterally extending pin 50 carried by eccentric 35. The position of pin50 and hook-shaped retaining finger 49 is arranged to arrest rotation ofeccentric 35 in the position shown in Fig. 2 where the portion ofeccentric 35 having the shortest radius is positioned toward power roll8. This position of trip lever 46 is determined by a stop arm 5| formedon the same end of trip lever 46 as finger 49 for engagement with stoppin 52 mounted on power arm 20. A tension spring 53 has one end securedto power arm 20 adjacent stop pin 52, as shown in Fig. 2, and theopposite end attached to lateral projection 54 on trip lever 46 at theend mounted on stud 41. Tension spring 53 normally operates trip lever46 in a counter-clockwise direction, as shown in Fig. 2, for positioninghook-shaped retaining finger 49 in position to engage laterallyextending pin 56 and stop rotation of eccentric 35. This position isdetermined by stop arm 5! engaging stop pin 52 limiting the motion oftrip lever 46 in a counter-clockwise direction by the operation oftension spring 53 as shown in Fig. 2.

Trip lever 46 at a point intermediate its mounting on stud 4'! and theend formed with hookshaped retaining finger 49 is formed with alaterally extending trip arm 55 for engagement by the trigger mechanismto be described. It will be noted that trip arm 55 and depending arm 48are located in front of or to the right of power driven roll 8 as shownin Fig. 2. A toggle link 56 is pivotally mounted at one end on pin 51fastened to the terminal portion of trip lever 46 at the opposite sideof pivot stud 41 from retaining finger 49 and in substantial alignmentwith the horizontal plane of the axis of stud 41. Toggle link 56 has theopposite bifurcated end engaged over supporting rod 58 carried by thelower rear edge of fulcrum bar Hi. The bifurcated end of each togglelink 56 extends into a slot in the lower edge of fulcrum bar It as shownin Fig. 2, while the end pivoted on pin 51 is provided with an angularlyextending stop finger 59 arranged to engage the lower end of dependingarm 48 to limit clockwise movement of toggle link 56 on pin 57, as shownin Fig. 2.

Toggle link 56 operates in cooperation with trip lever 46 forcontrolling the downward movement of power arm 20 or thecounter-clockwise rotation thereof about pivot rod 2 I as shown in Fig.2. The position of power arm 26 in the position of rest or No. 1position is controlled by toggle link with the parts ready for releaseto produce a power operation of one of the type bars or other poweroperated device. The toggle link 56 cooperates with the end of triplever 46 on which it is mounted to provide a toggle that is arranged ondead center when power arm 20 is in the position of rest ready to bereleased for power operation of a. type action as shown in Fig. 2.Tension springs 28 and 53 operate the trip mechanism and power arm toretain toggle link 56 with the portion at the bottom of the bifurcationengaged with supporting rod 58 as shown in Fig. 2, and trip lever 46having stop arm 5| engaged with stop pin 52. This position of rest orNo. 1 posi tion for the power arm and trip mechanism controlled by thepivotal movement of trip lever 46 and toggle link 56 provides for thesupport of the power arm with its eccentric 35 so that the periphery ofeccentric 35 is slightly spaced from the periphery of power roll 8. Thisposition and the spacing of the eccentric from the power roll in theposition of rest relative to power driven roll 8 is obtained by theadjustment of pivoted supporting brackets 13. By moving supportingbrackets !3 so that the rear ends carrying pivot screws I 2 are movedupwardly, the space between the periphery of the eccentrics and thepower roll will be increased. The space between the eccentric and thepower roll will be decreased as the adjustment on the rear ends ofbrackets I3 is made through moving them downwardly. The

aemon 9 desired adjustment is retained by tightening set screw [6.

The trigger mechanism. has a trip rocker: 65 provided for each power armand trip mechanism. Each trip. rocker 65. has the central portion formedto pivotally engage on rocker pivot rod 65. Rocker pivot rod 86 isrigidly secured to side frames l at opposite ends. Rocker comb plateEli's slotted at intervals to receive and mount the plurality of triprockers 65, one in each slot, in spaced parallel and aligned relationwith each trip mechanism and power arm assembly. Rocker comb plate 6!has the upper edge secured to the bottom faceof frame bar 41*. The lowerslotted margin of plate 61 is formed to engage around rocker pivot rod66 for retaining trip rockers 65 in the desired spaced relation on pivotrod 56 and to further aid in supporting the pivot rod. A trigger Ed ispivotally mounted at its lower end at 69 on the rear end of trip rocker6b and has an aperture l receiving pin H in laterally projectingrelation. Pin H is mounted on the rear central portion of trip rocker65. for limiting the pivotal movement of trigger b3 thereon. Ear 12provides" an anchor i for one end of a tension spring '13 having theother end attached to depending arm M on the rear end of trip rocker65'. Spring T3 normally operates trigger 6B in a counter clockwisedirection as shown in Fig. 2 for engaging the lower portion of thetrigger forming aperture 11) with pin i i, see Figs..2 and 5. Thisspring 13 normally retains trigger E8 in a position so that shoulder 15'on the upper end will be normally positioned just below trip arm 55.Trigger so will thus. be in position for moving trip lever 46 upondepression of a key lever. A finger 16 adjacent shoulder #5 forms theupper portion of trigger 68 and extends in front of trip arm 55 forcooperation with the shoulder and to retain trip arm 55 engaged thereonduring the entire upward operative movement of the trigger.

A tension spring ll is secured at one end to the lower rear intermediateportion of triprocker 65 and has the opposite end secured to springanchcr "l8. Spring anchor Ill is in the form. of a sheet metal stripmounted on and projecting forwardly from key lever supporting bar 19'.Key lever supporting bar 19 extends transversely between opposite sideframes I and has the opposite ends rigidly secured thereto.

It will be understood that a trip rocker and trigger assembly, as abovedescribed, is provided for each. power arm, a plurality being arrangedin spaced parallel relation below each power arm in the positionillustrated in the drawings. Each trigger assembly is associated with apower armand trip mechanism so that a trigger mechanism is provided forcontrolling and operating cash power arm.

A plurality of key levers 85', corresponding in number to the number oftype bars and other mechanism for key lever operation, are provided the.front of the machine to form a keyboard having the key caps on each ofthe key levers arranged in one of a plurality of rows in a manner wellknown in the. art. The rows of key caps on key levers 85 are positionedfor manual operation in the usual and well-known manner. The rear endsoi all the key levers are pivotally mounted on key lever pivot bar 86carried by key lever pivot plate ill. Key levers 85 extendiorwardly frompivot bar 86' in spaced parallel relation controlled by thespacing ofthe slots in plate Bl. Key levers 85' extend between adjacent trigplate.

gerassemblifes and trip: rockers; 65,. see: Figs. and 2. The.- keylevers each extend: forwardly and have the key caps on the. upwardlyextending ends to. form the usual keyboard of the typewriter. Akey levercomb, plate 88 hastheupper edge mounted on frame bar ll and the; lowerportion. slotted to receive,- guide and; limit the vertical movement. orkey levers B5: in their spaced parallel relation. A rebound. cushionstrip 8.9 ismozuntedon the front faceof comb plate BIB for limiting the.upward movement of the key levers: and forming a noise reducing stop;The downward; movement" of each key'leverislimited by an adjustable stopon the lower portion. of the comb Each key lever is. formed: with anupwardly projecting ear St: in the rear of comb plate 88; carrying alaterally extending pin 9! enga ed: over the upper edge of the forwardlyextending, arm of a key lever trip rocker 6,5,. as shown in. Fig. 2'.Tension. spring ll in operating trip rock-- or E5 in a counteraclockwisedirection as shown in Fig. 21, also. serves to. operate the: keyleverhaving pin B l engaged therewith in a counter-clock wise directionto. normally retain the correspond"- ing key lever against cushion stop89: in the position of rest, as shown in Fig. 2.v

In the operation or a typewriter constructed as shown in Figs. 1 to 6inclusive, manual depression of a key lever will move pin 8% downwardlyas shown in Fig. 2 in clockwise rotation. of key lever 85 about. itspivot. This will move the forwardly projecting end of key lever trip;rocker 65 downwardly and rotate the trip rocker III a clockwise:direction. raising the rear end thereof. The raising or the rear endwillmove trigger lid to engage shoulder I55 with trip arm. 55 of triplever 46-.

With particular reference to 5 and 6 it will be seen that in the upwardmovement of trigger 68 engagement. of. shoulder T5 with trip arm 55 willthen start movement of trip lever 46 in a clockwise direction. As thelever moves. from the position. of rest, the No. 1 position, Fig. 5,.the end or hook. shape retaining finger 499 will move eccentric 35 a.clockwise direction from the: full line; position in. Fig. 5: to the dotand dash 'line position as finger 49' clisengages from laterallyextending pin 50. Trip lever 46 in the further operation of; trigger 88by depression of the key lever moves: tothe dot; and dash line positionshownirr Fig. 5., designated position No. 2. In this movement of triplever 46 to the No. 2 position shown in. dot and dash lines, pin 51carrying. toggle link 56 will move out of the plane connecting the axisof stud 47 and! supporting rod- 5& into the dot and dash line positionshown in Fig. 5, to break the toggle and produce counter-clockwise ordownward movement of power arm 2 8 into the dot and dash line position,that is. the No. 2 position This downward movement is caused by thetension of power armv operating spring 2:23 which engages the peripheryof eccentric 35' with continuously rotating power driven roll 8:.

The moment the periphery of eccentric 35 en-.- gages power driven. roll8, rotating a clock wise direction, as.v shown in. Fig. 5 and indicatedby the arrow, it. will start eccentric 35. rotating in acounter-clockwise direction about its stub shaft 3.6. When eccentric 35has been rotated about 90degrees from the dot and dash line or No. 2position, as shown in Fig. 5, the eccentric will have moved power arm 20upwardly to some extent into the position shown in dot and dash linesdesignated'as No. 3 in Fig. 6. When the power arm and eccentric havereached this No. 3 position and the key lever is held manuallydepressed, trip arm 55 will be moved along shoulder 15 to a point whereit is ready to disengage from the free end of the shoulder, as shown indot and dash lines in Fig. 6. The immediate further movement ofeccentric 35 and power arm from the No. 3 position shown in Fig. 6, willallow trip arm 55 to disengage from shoulder 15 whereupon it willimmediately move to the position shown in full lines in Fig. 6 underoperation of tension spring 53.

As the rear end of power arm 20 moves upwardly through the operation ofeccentric 35, roller 22 will engage cam projection 23 on type bar bellcrank 24 and move it in a clockwise direction. In this power operationof a type bar bell crank 24, a type bar 5 will be power actuated toengage the type on the free end thereof with platen 34. As the power armis operated by the eccentric from the No. 2 position shown in Fig. 5, tothe No. 3 position shown in Fig. 6, roller 22 will engage cam projection23 and start the power operation of a type bar 5. This power operationwill continue through the operation of power arm 20 by eccentric 35until the eccentric is rotated into the position shown in Fig. 6 in fulllines where the portion of greatest radius is positioned between stubshaft 36 and power driven roll 8. This full line position of Fig. 6 isdesignated the No. 4 position and is the limit of power operation ofbell crank 24 by power arm 20 through engagement of roller 22 with camprojection 23 on the bell crank.

According to the adjustment of the position of fulcrum bar II] byfulcrum bar adjusting cam 43, power operation of a bell crank by anoperating arm 20 into the No. 4 position will be varied so that the typebar will be moved by power operation of operating arm 20 to an angularposition in advance of the platen varying from about 15 to 35 degrees.From this varied angular position determined by the adjustment offulcrum bar I0 by adjusting cam 43, the type bars are given the desiredamount of-inertia for moving through the remaining are and distance toen gage the type on the free end of the type bar with the platen, or asheet, or sheets of paper, engaged about the platen to secure thedesired printing operation. As fulcrum bar adjusting,

cam 43 is operated to move fulcrum bar I0 downwardly as shown in Fig. 2,the power operation,

of a type bar is obtained through a greater angle and into a positioncloser to the platen than when the .fulcrum bar is adjusted to its upperposition. As the type bar is power actuated tov the type bar against theplaten is used for obtain-.

ing a larger number of carbon copies while it is found that poweroperation of a type bar to a greater angle from the platen, such as ordegrees, will reduce the impact of the type with the platen and providea better adjustment for securing a clear impression where only one or afew typewritten copies are desired.

From the position of the parts, as shown in the No. 4 full line positionin Fig. 6, the operation of power arm 20 continues through rotation ofeccentric 35 by continuously rotatingpower roll 8 until eccentric 35completes one revolution. Fig.

6 shows trip lever 46 in full lines in a position where it hasbecomereleased from trigger 63 with trip lever 46 rotated in acounter-clockwise direction until its movement is arrested by engagementof stop arm 5| with stop pin 52. This movement of trip lever 46 alsomoves the toggle from the broken position shown in dot and dash lines inFig. 5, position No. 2, back to a position where the toggle isstraightened. Operating arm 20 will move downwardly under the action oftension spring 28 with continued rotation of eccentric 35 untillaterally extending pin 58 again en gages hook-shape retaining finger55. As this movement from the No. a position in Fig. 6, back to theposition shown in Figs. 2 and 5 in full lines forming the No. l orstarting position, takes place trip arm 55 will move downwardly belowshoulder 15 on trigger 68. The trigger and key lever controllingit holdthe trigger in the raised position and the depressed position of the keylever. As operating arm 29 moves downwardly and laterally extending pin50 engages finger 9, toggle link 56 will move from the full line, No. aposition, shown in Fig. 6, into the position shown in Figs. 1 and 5forming the No. 1 position, where the portion of the toggle link 58 atthe bottom of the bifurcated end will engage supporting rod 58 and limitdownward movement of operating arm 23. This limiting of the downwardmovement of operating arm 23 will limit downward movement of arm 26 sothat eccentric 35 will disengage power roll 8 as laterally extending pin5i] engages retaining finger 39.

This restores the power operating mechanism to the starting or No. 1position. With this operation of the trigger, trip mechanism, power armand eccentric 35 from power roll 8, it will be seen that a repeatoperation for one depression of a key lever cannot be obtained due tothe disengagement of trip arm 55 from shoulder 15 on trigger 68 while akey lever is held in depressed position. The operation of the power arm,trigger and trip mechanism is very rapid. The operation is so rapid thatunless provision is made for trip arm 55 to disengage from the triggermechanism, it would be diiiicult to manually operate a key lever withoutsecuring more than one operation of the type bar controlled thereby. Itshould therefore be understood that for each depression of a key leveronly one type bar operation will be secured with power operation of anarm 29.

As soonas a depressed key lever is released it will move back to itsinitial starting position. In this movement trigger 58 will have theleft-hand edge portion below shoulder engage the righthand portion oftrip arm 55. Trigger '53 will slidably move along trip arm 55 untilshoulder 15 moves below the trip arm when it will move into thestartingor No. 1 position, as shown in Figs. 2 and 5, in full lines.This movement of trigger 68 back to the starting position in engagementwith trip arm 55 causes trigger 68 to move on its pivot on trip rocker55 against the tension of spring 73. Trigger E38 will rotate in aclockwise direction, as shown in Figs. 2 and 5, for example, in thisreturn movement to the starting position so that the lower portion ofthe trigger normally engaged with pin "i i will move away from the pin.Aperture H! is sufficiently larger than pin it to provide for thismovement of the trigger so that shoulder F5 can ride along trip arm 55into the starting position. As the shoulder 75 disengages from arm 55 inthe return movement of a key lever to starting position, trigger 68 willbe operated by spring 73 in a counter-clockwise direction until itreaches the full line position, as shown in tion where triplever lilo isat the upper limit of its movement in slot Iilii with cylindrical bossI04 having its axis directly above the axis of stub shaft m5. In thisposition of the parts tension spring I62 is under substantial tensionwith pin It'll positioned in the central portion of the slot ineccentric slide Ifilil. Trigger :1 I l is at the lower limit of itsmovement as indicated by guide pin I I3 engaged with the trigger at theupper end of the slot.

By depressing key lever IIG, trip rocker lid is moved in a clockwisedirection from the position shown in Fig. l, to that shown in Fig. 8,for moving trigger Ill upwardly relative to power arm 95 until pin Iii;is located in the lower portion of the slot formed in the trigger. Thisdisengages trigger arm H2 from trip arm Itil. As

soon as trigger arm Iii! disengages trip arm H39,

spring I02 operates eccentric slide I96 toward the left from theposition shown in Fig. 7 to that shown in Fig. 8 for rotating eccentricm3 until the periphery engages power roll 33. As soon as the peripheryof eccentric its engages the power roll, which takes place in theposition of the parts shown approximately in Fig. 8, providing what maybe termed the No. 2 position of the parts in a cycle of operation, thepower roll rapidly rotates the eccentric. As the eccentric rotates onstub shaft I05 cylindrical boss Hit in cooper tion with pin It! movestrip lever I86 downwardly in slot IE8 from the position shown in Fig. 7to the position shown in Fig. 8 and thereafter the downward movementcontinues to the position shown in Fig. 9. In this operation ofeccentric Hi3 from the No. 2 position to the No.

4; position shown in Fig. 9, and corresponding to the similar positionshown in 5 and eccentric ltd is moved until its portion of maximumradius between the stub shaft and the periphery is in downwardlyextending relation engaged with power roll 8. In this operation ofeccentric 2'03 by the power roll, power arm 95 is moved from the lowerposition shown in Figs. '7 and 8, to its upper position of movement inthe power operating stroke for engaging cam projection 23 on bell crankit and producing a power operation of a type bar as hereinabovedescribed for printing a character on paper placed about the typewriterplaten.

From the No. 4 position shown in Fig. 9, power roll 8 continues torotate eccentric I03 to complete one revolution about stub shaft m5.During this continued rotation of eccentric I03, the right-hand end ofeccentric slide I with trip lever I95 moves upwardly in slot Hi8relative to power arm 95. With the key lever held in depressed positionas shown in Figs. 8 to 10, trigger Ill is held in its uppermost positionduring this power operation or" power arm 95 by the eccentric. As theeccentric completes its revolution about stub shaft ital, trip lever Hi6is moved into a position where check arm H0 will engage to the right of,or behind trigger arm II2. As eccentric i533 and eccentric slide Hillreach this position, eccentric ltd becomes disengaged from power roll 8and cylindrical boss Iii i is moved so that its axis is substantiallyabove stub shaft I whereupon spring I02 tends to operate eccentric slideI60 to the left as shown in Fig. 10. Foot 98 engages stop bar 99 andlimits downward movement of power arm 95.

As soon as key lever H6 is released so that it will be returned to itsupper normal position of rest, as shown in Fig. '7, trigger arm II 2will disengage check arm I it by downward movement relative to triplever I06. Spring I02 will then operate eccentric slide I00 and triplever I06 to engage trip arm I09 with trigger arm II2 restoring theparts to the position shown in Fig. '7. Check arm IIIl cooperates withtrigger arm H2 for retaining eccentric slide I00 against operation byspring I02 to reengage eccentric I33 with power roll 8 and prevent arepeat operation of the power arm and type bar actuated thereby. Inother words, the cooperation between trigger III and trip lever I03 withthe respective trip arm I09 and check arm H0 controls operation of thepower arm so that only one type bar actuation is obtained for eachdepression of a key lover I I6. It will be noted that in operation fromthe positions shown in Figs. 7 to 10, trip lever I06 oscillates aboutguide projection Iiil so that the upper end moves in a counter-clockwisedirection from the position of Fig. 7 to the position of Fig. 9. Thismovement of the upper end of trip lever I06 continues for moving checkarm Ill! to the right of trigger arm II2 for engaging it behind thetrigger arm to limit spring operated movement of eccentric slide Iilli.

Fig. 12 shows another modification of the invention in which the powerarm and trigger assembly is constructed in the same manner as shown inFigs. 1 to 6 inclusive. The structure of the trip lever is slightlymodified in Fig. 12 from that hereinbefore described. This modificationprovides a trip lever I20 pivoted on a stud I2I carried by power arm I22of substantially duplicate construction to power arm 29. The upper endof trip lever I20 is formed with a hookedshape portion for retainingeccentric I23 against rotation on the power arm. The trip lever at theopposite side of stud I2I from the portion engaging eccentric I23rotatably mounts a toggle roller lid having peripheral rollingengagement with toggle plate I25 jointly secured on the rear facet offulcrum bar I26 with spring anchor member I21. A tension spring lit hasits upper end connected to spring anchor I2? and its lower end securedto a lateral projection on trip lever I20 for normally rotating the triplever in a counter-clockwise direction as shown in Fig. 12.

The axis of toggle roller I2 3 in the position of rest or startingposition of the trigger mechanism, trip lever and power arm, lies in thehorizontal plane with the axis of pivot stud I2 l This provides for thesup-port of power arm I22 with the peripheral portion of eccentric I252having the shortest radius arranged in adjacent but spaced relation tothe periphery of power roll 8, as shown in Fig. 12. The modificationconsists principally in providing roller I2 1 as a substitute for thetoggle link of Figs. 1 to 6. Whenever the trigger mechanism operatestrip lever I20 in the manner hereinabove described in connection withFigs. 1 to 6, roller IN will move downwardly along toggle plate I25 andshorten the distance between plate I25 and the axis of stud I2I. Thisproduces downward movement of power arm I22 under the operation of thespring 28 connected to the rear end of the power arm, asdiagrammatically illustrated in Fig. 12, for engaging the periphery ofeccentric I23 with the periphery of power roll 8 after trip lever I20has disengaged the pin carried by the eccentric. Since the operation ofa trip lever like I20 is fully explained in the description of operationof the structure shown in Figs. 1 to 6 inclusive, it should be clearlyunderstood how the structure shown in Fig. 12 will complete a cycle ofoperation to produce a power operation of a type bar through one revolu-17 Mi tion ofrotation of eccentric I23 about its pivotal mQlinting "em"power arm. '6 21.2.

A iurther modified construction of the power arm and trip levermechanism is, shown in Figs. 1-3' and 14. Figs' 13: and 14 illustrateopposite sides of the power arm Without showing the rnounti 'ig on thefulcrum bar and other associated parts in View of the fact that thepower arm assembly. of these figures can. be substituted for thecorresponding parts. shown in Figs. 1 tot. This modified power armconstruction comprises a pair of sections having a pivot section 8.38;and an operating arrn section r35. Pivotsection I has; an aperture I32for receiving pivot rod 21 to pivotally mount the rightehand end of thepower arm on the fulcrum bar. i'he centralpon tion of arm section 'iiiis pivo'teclonstud mounted on the end of pivot section its opposite theend having aperture I32. The fight-hand end or arni section It], asshown in 13, is secured to the opposite end portion oi pivot section aremeans of eccentric stud I35. Eccenr G 5. 1 1 5341 a a en a n h 9 5 fe orsection lilion one side, as shown in Fig. l;4= a cylindrical portionextending through an aperture in the end of arm 13! and engaging theadjacent face of pivot section I39 in enclwise relation over slot Hi5formed in section Hill. A look screw {36 has the head thereon engagingthe opposite face of pivot section 5351 as shown in Fig. 13, from thatengaged by the end or eccentric stud it fil, with the shank extendingthrough slot Hi5 and having a smaller diameter than eccentric stud [34.The end of the shank of loci; screw 13 5 is threaded in eccentricrelation in eccentric stud iii-i for tightly securing stud 13.4 againstrotation relative to pivot section iliii and also tightly securing theright-hand end ofoperating arm section ilii, as shown in 13, to sectionits against relative movement. By loosening loci; screw [35, eccentricbolt it may be rotated to move the right-hand end of operating armsection {31, as shown in i Fig. 13, up or down for adjusting theposition of the free end of arm section 13! relative to the planeextending through the axis of aperture Hi2 and pivot stud I533. The freeend of operating arm section Hit carries a roller [3] similar to roller22, as shown in Fig.1, positioned for engaging and operating a two barbell crank. The U position or roller l3? on each power arm of a seriesfor operating the typing and other devices may be adjusted relative toeach other by adjusting the position of roller it? relative to the planethrough stud 13-3 and aperture 632 by the rotation of eccentric studiii.

A stub shaft 13%! is mounted on pivot section 5393 with its axis inspaced parallel relation alcove pow-er driven roll 8. An eccentric I39having a cam shaped periphery is rotatably mounted on stub shaft in aposition to have its periphery the periphery of power driven roll 8. Theinner marginal portion of eccentric I39 is recessed to provide angularshoulder portions I 40 formed to receive the retaining finger Mi on oneend portion of trip member hi2 pivoted at the opposite end. at its onpivot section I30 of the lower arm. Trip member 12 has another portionof the first-mentioned end extending in angular relation to retainingfinger M! and formed w p fi r is p si i ned t n e i n 111 M5 mounted onpivot section 139 at the lower end o i m b r M2 for im t n the o k sincreme t c r mber '43 chart ts vot M he iph r and; tru alinemberillustrated in Fig.

A portion of the trip lev n opposite side oi pivot stud Hi1 irom that paforrnedwitli trip lint; IE1 is, a dull in Figs. 1. to. .6;

a, eem b r can, new mre- 113 ihl i h ens seme ofttil meme to minim-finer "t s? S i 't cc of se ies MB..- Th s pet iiqn 1 rip lever [it andinmcmbc 1. 2, y he tri e w l m re ense inger W u 9. he re s in'eccentrictile-r d break the} toggle th g h toggle link I55 to provid-Qcounter-clockwise ncrement of the power arin sections l3}! and I3!about" the putt n he ti Qt n d erteuqin through'aperture 532, movementwill bring of eccentric [39 on release by i io qn es m l9 spacedrelation to power driven roll 6. Then, by adjusting eccentric studl34operating arm section I3Imay be adjusted relative to section I tochange the position of roller I31 to the asso ciated bell crank lever."This adjustment provides for the variation in the operation of theseveral bell cranks or other devices by respective power'arms so as tochange the character of type impression of one type action to another.By this adjustment uniform impacts of each type bar with the platen canbe obtained to compensate for variations in-dimension and tolerancebetween the parts of the power operating mechanism. This adjustmentprovides a simple means for obtaining uniformity of power operation ofall of the independent type actions and other devices on the typewriterwhich are power operated through manual actuation of a key lever on thekeyboard.

With the present invention a light pressure can be provided for manualkey lever operation in which the downward movement of the key levers maybe limited by key lever comb plate 86. Only suificient force is requiredin depressing a key lever to operate the trigger and trip member toovercome the tension of the springs normally holding these members inthe position of rest.

.After the trigger operates the trip member to release the eccentric andbreak the toggle or other means for retaining the eccentric out ofengage-- ment with the power driven roll, the operation of the varioustype actions and other devices in the typewriter is secured solelythrough power operation from the oscillating movement of each power armby its eccentric from power driven roll 6.

Each of the power arms and trip levers are assembled as a unit to form apower arm assembly while each trigger is connected with its rocker armto form a trigger assembly with a key lever. This assembly mechanismprovides a convenient subassembly feature that provides for economy inconstruction, assembly and servicing of a typewriter having this poweroperating mechanism.

A ribbon vibrator is operated in the power operation of each type barand has the usual ribbon guide I slidably mounted on the rear side oftype guide 2 in the usual manner. The lower end of ribbon guide I55 ispivotally connected to the forward end of supporting lever I56 havingits rear end mounted on shaft I51 rotatable in bracket I58 suspendedfrom supporting plate I59 secured to type segment 3 and movabletherewith. One end of shaft I51 at the outer side of bracket I58 carriesa selector arm I66 having an inverted T-shaped slot [6] formed in thefree end thereof.

A universal shaft I62 is mounted at opposite ends on side frames I foroscillating movement and carries a universal bar I63 extending entirelyacross the typewriter between side frames I with one margin secured touniversal shaft I62 and the opposite marginal portion engaged overrearwardly extending arms 36 of all of the type bar 7 bell cranks 24. Arock arm I has one end secured to an intermediate portion of universalshaft I62 and extends in a direction opposite from universal bar I63toward the rear of the typewriter with the rear end offset upwardly andbifurcated. The bifurcated rear end of rock arm I64 is engaged about apivot stud I65 carried by rocker arm I66 rotatably mounted on theforwardly extending supporting arm I61 formed on the lower end ofbracket I68 having the upper end detachably secured to shift bar 4intermediate the ends thereof and forming part of the supportingstructure for the vertically movable type segment 3. A leaf spring I69mounted on arm I61 has a pair of arms I16 and Ill arranged above andbelow rocker arm I66 for cooperation therewith to limit the rockingmovement of the rocker arm during the operation of ribbon guide 155. Aleaf spring I12 has one end mounted on bracket I66 and the opposite endengaged with universal bar I63 for normally rotating universal shaft I52in a clockwise direction, as shown in Fig. 2, and maintaining universalbar Q63 in en gagement with rearwardly extending arms 30 o the type barbell cranks.

Bracket I56 rotatably mounts shaft I13 in the lower end thereof carryinga laterally extending arm I14 on one end. Arm I14 has a guide pin I15 onthe free end thereof. A vibrator link I16 has the lower end pivotallyconnected to rocker arm I66 at the end opposite from that carrying pivotstud I65 engaging rock arm I64. The upper end of vibrator link I16 isformed With a slot I11 slidably engaged with guide pin I15 carried byarm I14 while the upper terminal portion of the vibrator link has alaterally extending operating pin I18 engaged in the inverted T-shapedslot I6I. Suitable manually operated means is connected with shaft I13for rotating the shaft so that vibrator link I16 can have the operatingpin selectively adjusted into either end of the horizontal portion ofT-shaped slot I6I or aligned with intermediate and the verticallyextending portions thereof. When link I16 has operating pin H6 alignedwith the vertically extending portion of inverted T-shaped slot I6I, theoperation of the oscillator link will not vibrate the ribbon guide. Thisis used when the typewriter is to be used for stencilling and similarpurposes where a ribbon is not employed during the typing operation.This mechanism for adjusting the position of the vibrator link and formoving the rib bon guide upwardly for each type bar operation is ofsubstantially conventional design as used in the Remington typewriterwith the exception that the bracket and rocker arm construction connected with the lower end of the vibrator link for operation by the typebar bell cranks is a new construction combined with the old constructionso that the ribbon guide may be vibrated to move the ribbon intoposition to be engaged by the type on the type bars for printing in theusual manner. The construction shown facilitates the operation of theribbon guide from the type bar bell cranks and forms a convenientconstruction for operating the ribbon guide in a power operated machineof the character disclosed herein.

Fig. 15 shows a modified form of trigger designated I80, similar totrigger 68. Trigger I66 has the shoulder and finger construction on theupper edge similar to trigger 68. Trigger I has a repeat projection I8Iat the end of the shoulder opposite the finger for engaging andretaining This projection I8I enables an operator by holding a key leverdepressed to retain a trip lever on a selected power arm in a disengagedposition relative to the eccentric with the toggle broken and theeccentric continually engaged with power roll 3. The power arm will berepeatedly oscillated to power operate the bell crank and power operatemechanism connected therewith. This repeat operation is used forcontrolling power operation of a carriage return and line spacemechanism. By this repeat operation the carriage return and line spacemechanism is power operated at the end of the carriage return movementto rapidly feed the paper into and out of the machine. It is 2.1 also sul. t s cu e epeated opera ion at the nd sc in type ar and any othertrains r other devices on. the typewriter where repeat el oration may bedesirable while a key lev r s do pressed.

The invention claimed is:

i. In a powerv operated; typewriter having a power driven roll, aplurality of typing .andeliher operated devices and a plurality otkey.levers, one for each typing and. other operated; device, the combinationof a plurality of power arms pivoted at one end and each arranged to.have. the op.- posits end engage and operate one of said typing andother operated devices in pivotal movement thereof in one direction, aplurality of eccentrics, one eccentric rotatably mounted on. each powerarm for peripheral engagement with said power driven roll to move saidpower arm on its, pivot in operating one of said devices, trip meansincluding a plurality of tripllevers, each pivotally mounted on one ofsaid power arms and having a portion thereof latching the eccentricagainst rotation, trigger means for each power arm op: erating said triplever to release said eccentric for engagement with and operation bysaid power driven roll for moving said power arm to operate one of saiddevices, and lacy lever actuated means for operating each of saidtrigger means to. engage its trip lever and release its eccentricwhereby each typing or other device is power operated by manualoperation of the corresponding hey lever. 2. A power operated typewriteras claimed in claim 1 wherein a fulcrum bar pivotally mounts said powerarms at one end and is engaged by said trip means in holding saideccentric and power arm in inoperative position; and means for adjustingthe position of said fulcrum har relative to said power driven roll andsaid devices for varying the operation of said devices by said powerarms. i

3. A typewriter claimed in claim 1 having plural projections on saidtrip lever sequently engageable by a shoulder on the trigger means forsecuring only a single operation of a typing or other device for eachoperation of a key lever.

4. A typewriter as claimed in claim 1, having said trip means for eachpower arm comprising a trip lever pivotally mounted on the power armintermediate the ends, one end of said triplever being formed into hookshape for engaging a stoppin on the eccentric carried by said arm andcontrolling rotation of said eccentric, the other end of said trip leverhaving means mounted thereon for engaging a fixed part of saidtypewriter and cooperating therewith to control movement of said powerarm according to the position of said trip lever.

5. A typewriter as claimed in claim 1, having said trip means for eachpower arm comprising a trip member pivoted on said power arm having endportion formed to engage a complementary portion on the eccentric andretain said eccentric against rotation, and toggle means one gaged withsaid trip member and with a part on said typewriter fixed in. positionrelative to the pivot for said power arm and controlling the pivotalmovement of said. power arm in one direction.

6. A typewriter as claimed in claim 1, having the trip means for eachpower arm comprising a trip member pivoted on said power arm having aportion formed to engage a complementary portion on the eccentric andretaining said eccentric against rotation, a trip member pivoted on said22 p wer onerableiiar nsas ne' ndmo in aid trip mea a ds t g le pivotedon said trip lever and en ag ng apa t o said t pewriterfined relative tothe vot fo said newer m: and contr llin the p vo al movem nt d rower armin on rec n Y i 7' A. y ewrit r as do ned in l im havin the twin meansor rower arm some as ins trip leve e a ed on s id power arm 1. no an endn t me terme to access a can on t e smears a d r n s i e es t againstrotation, stop means for limiting piv l movement o s id tr o lever, resien m an co c ed to said pow r a m andt c e 0 mallvmovin said his lo er io ecc n tamin p sition, and a toggle li t v te Q trio lev ra d en a in aa on a ype e f fixed relative to the. pivot for said power. armcontrolling the pivotal movement ofsaid power arm in one direction.

3-. A typewriter as claimed in claim. Lhaving the trip means for eachpower arm comprising a rip lever pivote on sa d wer arm with anndportion formed to control r cation of said eeoentric, stop means forlimiting pivotal movement of said trip lever on saidpower arm, ressilient means connected to said power arm and trip lever tor normally.moving said trip lever into eccentric retaining position, a trip armextending laterally from said trip lever intermediate the ends andengageable for moving said trip lever, and a toggle link pivoted on saidtrip lever and n a n a pa t n said. yp writ fixed relative to the pivotfor said power arm and. controlling the pivotal movement of said powerarm. in one direction.

9, A typewriter as claimed in claim 1, wherein the trip means for eachpower arm comprises a pair of trip lever sections pivoted on said powerarm, one section havinga part engaging a part on the eccentric to holdsaid eccentric against rotation, eachsection having projections for onegagerpent for pivotal movementoi said one sec tion by the other, tensionspring connecting said trip lever sections for normally moving saidsections into one position where said one section engages saideccentric, stop means on each SEC-r tion for engaging said power arm andlimiting pivotal movement, a trip. on said other sec tion engageabie tooperate. hoth sections to disengage said one sectionfrom said eccentric,and a toggle link pivoted on said trip lever and :engaging a part onsaid typewriter fixed relative to the pivot for said power arm andcontrolling the pivotal movement 02 said power arm in one dire tion it i10. A typewriter as claimed in claim 1, wherein the trip means for eachpower arm comprises a trip lever pivoted on r arm with an end portionformed to control rota ion of said eccentric, stop means for limitingpivotal movement of said trip lever on said power arm, resilient meansconnected to said trip lever for normally operating said trip lever inone direc tion to engage and said eccentric against rotation, a trip armextending laterally from said the trip means for each power armcomprises a trip lever pivoted on said power arm having an end portionformed to engage a part on the eccentric and retain said eccentricagainst rotation, resilient means connected with said trip lever fornormally rotating it into eccentric retaining position, and a roller onthe opposite end of said trip lever engaging a part on said typewriterfixed relative to the pivot for said power arm and controlling thepivotal movement of said power arm in one direction in cooperation withsaid trip lever. '12. In a typewriter as claimed in claim 1, aneccentric slide, wherein said eccentric slide rotatably receives-a parton said eccentric intermediate its ends, one end of said slide having aslidable pivot connection with said power arm, a trip lever mounted onthe other end of said eccentric slide having a part on one end slidablyengaged with said power arm, a trip arm eX- tending laterally from theopposite end of said trip lever latchable by the trigger means to securesaid slide against slidable movement, and resilient means connected tothe power arm and eccentric slide for normally moving said slide in onedirection and rotating said eccentric to engage the power roll uponrelease of the trip arm by operation of said trigger means.

13. In a typewriter as claimed in claim 1, an

eccentric slide having an eccentric rotatably mounted thereon, andwherein the eccentric is provided with a cylindrical boss rotatablyengaged in the central portion of the eccentric slide, said eccentricslide having one end provided with a slidable pivot connection to saidpower arm, a trip lever pivotally mounted on the opposite end of saideccentric slide, said trip lever being formed at one end for slidablyengaging in a slot formed in said power arm and the opposite end formedwith a laterally extending trip arm, resilient means connecting saidpower arm and eccentric slide for normally moving said eccentric slidein one direction to engage said eccentric with the power roll, and atrigger slidably latched with said power arm adjacent said trip leverhaving a laterally extending trigger arm for latching said trip arm toretain said eccentric slide in one position with said eccentricdisengaged from the power roll.

14. A power operated typewriter comprising a power driven roll, aplurality of type actions, a plurality of power arms, one for each typeaction having one end positioned to engage one of said type actions, aplurality of eccentrics, one rotatably mounted on each power arm andpositioned to have peripheral engagement with said power driven roll, apluralityof trip levers, each pivoted on one of said power arms andhaving an end engaging the eccentric on said power arm in one positionfor holding it against rotation, a fulcrum bar pivotally mounting saidpower arms at one end in spaced parallel relation, means on each of saidtrip levers engaging said fulcrum bar for cooperation in supporting saidpower arms in inoperative position with said eccentrics spaced fromsaid'power driven roll when said trip levers areengaged with saideccentrics, trigger means for each trip lever, and a plurality of keylevers, one for each type action and power arm for engaging said triggermeans for one of said trip levers and operating said trigger means andtrip lever to disengage said eccentric and move said power arm on itspivotal mounting on said fulcrum bar to engage the cocentric with saidpower roll for rotation to move said power arm to engage and operate oneof said type actions.

15. A typewriter as claimed in claim 3, having said fulcrum bar movablecoaxially to said eccentrics for adjusting the effective operation ofsaid type actions by said power arms, and manually operable means foradjusting the position of said fulcrum bar.

16. A power operated typewriter comprising a power driven roll, aplurality of type actions, a plurality of power arms, one for each typeaction, a fulcrum bar having one end of each power arm pivotally mountedthereon, said arms extending transversely to said power driven roll andthe opposite end of each arm being formed to engage one of said typeactions, a plurality of eccentrics, each mounted on one of said powerarms intermediate the ends in position to engage said power driven roll,a plurality of trip levers, each pivotally mounted on one of said powerarms having one end formed to control rotation of said eccentric on saidpower arm and engagement with said power driven roll, toggle means oneach of said trip levers cooperating with said fulcrum bar for limitingmovement of each power arm and eccentric toward said power driven rollfor supporting each arm and eccentric in spaced relation to said powerdriven roll controlled by said trip levers, a plurality of triggers, onefor each trip lever, and a plurality of key levers, each positioned foroperating one of said triggers to engage a corresponding trip. lever andmove it into disengaged position releasing said eccentric for movementinto engagement with said power driven roll upon manual operationthereof whereby said power roll will rotate said eccentric and move saidpower arm to engage and operate a type action according to selected keylever operation.

17. A typewriter as claimed in claim 5 in which the toggle meanscooperating with said fulcrum bar comprises a toggle for each power armhaving one end connected to a trip lever and the opposite end engagedwith said fulcrum bar.

18. A typewriter as set forth in claim 5, wherein each trip lever has aprojection thereon latchable by a trigger shouldensaid shoulderreleasable to unlatch said trip lever and release the eccentric forengagement with the power roll and said projection displaceable to asecond latching position by the revolving eccentric to thereby limitsaid eccentric to one revolution.

FREDERICK W. SCI-IREMP.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,173,321 Steiner Feb. 29, 1916 1,227,846 Smathers May 29,1917 1,828,755 Von Reppert Oct. 27, 1931 2,453,287 Von Reppert Nov. 9,1948

